（1）文件上传
代码：
@RequestMapping(value = "doUpload", method = RequestMethod.POST)public String doUpload(@ModelAttribute BookHelper bookHelper, Model model, HttpSession session) throws IllegalStateException, IOException, ParseException {logger.info("you are uploading a book! ");logger.info("This book is " + bookHelper.getTitle() + "!");String fileName = bookHelper.getBookFile().getOriginalFilename();String bookCover = bookHelper.getBookCover().getOriginalFilename();MultipartFile bookFile = bookHelper.getBookFile();MultipartFile coverFile = bookHelper.getBookCover();if (bookFile.isEmpty()) {logger.info("Uploading failed! The book you are uploading is empty!");return "upload_failed";} else if (coverFile.isEmpty()) {logger.info("Uploading failed! The book cover you are uploading is empty!");return "upload_failed";} else {String typeId = "" + bookHelper.getLargeType() + bookHelper.getSmallType();int type_id = Integer.parseInt(typeId);String format = fileName.substring(fileName.lastIndexOf('.') + 1);List<String> typeNames;typeNames = bookService.getTypeNames(type_id);String filePath_pre = (String) PropertyConfigurer.getProperty("book_path");String filePath = filePath_pre + typeNames.get(0) +"/" + typeNames.get(1) + "/" +bookHelper.getTitle() + "." + format;File localBookFile = new File(filePath);if (localBookFile.exists()) {logger.info("Uploading failed! The book is existed!");return "upload_failed2";}bookFile.transferTo(localBookFile);String coverPath_pre = (String) PropertyConfigurer.getProperty("book_cover_path");String coverPath = coverPath_pre + typeNames.get(0) +"/" + typeNames.get(1) + "/" +bookHelper.getTitle() + ".jpg";File localCoverFile = new File(coverPath);coverFile.transferTo(localCoverFile);logger.info("The book has uploaded to local path successfully!");Book book = new Book();book.setBook_title(bookHelper.getTitle());book.setBook_author(bookHelper.getAuthor());SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM");Date date = dateFormat.parse(bookHelper.getPubYear());book.setBook_pubYear(date);book.setBook_summary(bookHelper.getSummary());book.setType_id(type_id);book.setBook_format(format);book.setDownload_times(0);book.setBook_file(filePath);book.setBook_cover(coverPath);dateFormat = new SimpleDateFormat("yyMMdd", Locale.CHINESE);String pubDate = dateFormat.format(date);String upDate = dateFormat.format(new Date());int random = new Random().nextInt(900) + 100;String idStr = "" + typeId + pubDate + upDate + random;long bookID = Long.parseLong(idStr);logger.info("The book id you uploaded is " + bookID);book.setId(bookID);bookService.uploadBook(book);UserHelper userHelper = (UserHelper) session.getAttribute("userHelper");bookService.updateRecords(userHelper.getId(), bookID);userService.updateUserContribution(2, userHelper.getId());model.addAttribute("bookID", bookID);logger.info("you are coming to the uploading successful page!");return "upload_success";}}public List<String> getTypeNames(int id) {BookType bookType;bookType = bookTypeDao.queryById(id);List<String> typeNames = new ArrayList<String>();typeNames.add(bookType.getLarge_type_name());typeNames.add(bookType.getSmall_type_name());return typeNames;} 
前端代码：
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!DOCTYPE html>
<html>
<head><meta><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1"><link type="text/css" rel="stylesheet"href="${pageContext.request.contextPath }/resources/css/bootstrap.min.css" /><link type="text/css" rel="stylesheet"href="${pageContext.request.contextPath }/resources/css/bootstrap-datetimepicker.min.css" /><link type="text/css" rel="stylesheet"href="${pageContext.request.contextPath }/resources/css/upload.css" /><title>敛书网 - 文件上传</title>
</head>
<body>
<%@include file="common/loginHead.jsp"%><%@include file="common/userHead.jsp"%><div id="upload" class="container"><br><div class="row"><div class="col-md-12 "><div class="panel panel-info"><div class="panel-heading"><span class="h5 text-success">上传文件</span></div><div class="panel-body"><div id="myAlert" class="alert alert-warning hide"><a href="#" class="close" data-dismiss="alert">×</a><span id="form-tips" class="text-danger col-md-offset-1"></span></div><form id="uploadForm" class="form-horizontal" action="doUpload"enctype="multipart/form-data" method="POST" onsubmit="return checkUploadForm();"><div class="form-group"><label for="title" class="control-label col-md-1 text-danger">标题</label><div class="col-md-3"><input id="title" name="title" class="form-control" type="text"placeholder="请填写书籍名称"></div><label for="author" class="control-label col-md-1 text-warning">作者</label><div class="col-md-3"><input id="author" name="author" class="form-control" type="text"placeholder="请填写作者姓名，杂志填无"></div></div><div class="form-group"><label for="pubYear" class="control-label col-md-1">年月</label><div class="col-md-3"><input id="pubYear" name="pubYear" class="form-control datetimepicker"placeholder=" 请选择出版年月"></div><label class="control-label col-md-1">类别</label><div class="col-md-2"><select id="largeType" name="largeType" class="form-control"><option value="1">经典文学</option><option value="2">通俗小说</option><option value="3">计算机类</option><option value="4">杂志期刊</option></select></div><div class="col-md-2"><select id="smallType" name="smallType" class="form-control"></select></div></div><div class="form-group"><label for="summary" class="control-label col-md-1 text-info">简介</label><div class="col-md-6"><textarea id="summary" name="summary" class="form-control" rows="2"></textarea></div></div><div class="form-group"><label for="fileUpload" class="control-label col-md-1 text-success">文件</label><div class="input-group col-md-5"><input id="fileInfo" class="form-control" readonly type="text"placeholder="支持txt,epub,mobi和pdf格式"><span class="input-group-addon btn btn-success btn-file">Browse <input id="fileUpload" name="bookFile" type="file"></span></div></div><div class="form-group"><label for="imageUpload" class="control-label col-md-1 text-success">封面</label><div class="input-group col-md-5"><input id="imageInfo" class="form-control" readonly type="text"placeholder="支持jpg和png图片格式"><span class="input-group-addon btn btn-success btn-file">Browse <input id="imageUpload" name="bookCover" type="file"></span></div></div><br><div class="form-group"><div class="col-lg-4 col-md-offset-3"><button id="submitBtn" class="btn btn-primary" type="submit" onclick="">提交</button><button class="btn btn-info col-md-offset-2" type="reset">重置</button></div></div></form></div></div></div></div></div><hr><footer><p class="text-center">© 2023</p>
</footer><script src="${pageContext.request.contextPath}/resources/js/jquery-3.1.1.min.js"></script>
<script src="${pageContext.request.contextPath}/resources/js/jquery.cookie.js"></script>
<script src="${pageContext.request.contextPath}/resources/js/bootstrap.min.js"></script>
<script src="${pageContext.request.contextPath}/resources/js/bootstrap-datetimepicker.min.js"></script>
<script src="${pageContext.request.contextPath}/resources/js/userLogin.js"></script>
<script src="${pageContext.request.contextPath}/resources/js/userRegister.js"></script>
<script src="${pageContext.request.contextPath}/resources/js/upload.js"></script>
<script>function checkUploadForm() {var title = $('#upload #title').val();var author = $('#upload #author').val();var pubYear = $('#upload #pubYear').val();var summary = $('#upload #summary').val();var fileInfo = $('#fileInfo').val();var imageInfo = $('#imageInfo').val();var $formTip = $('#myAlert #form-tips');var fileArr = ["txt","epub","mobi","pdf"];var imageArr = ["jpg","png"];var $alert = $('#myAlert');if (title.length == 0) {$formTip.html("标题不能为空!");$alert.removeClass('hide');$('#upload #title').focus();return false;} else if(author.length == 0) {$formTip.html("作者不能为空!");$alert.removeClass('hide');$('#upload #author').focus();return false;} else if (pubYear.length == 0) {$formTip.html("出版时间不能为空!");$alert.removeClass('hide');$('#upload #pubYear').focus();return false;} else if (summary.length == 0) {$formTip.html("简介不能为空!");$alert.removeClass('hide');$('#upload #summary').focus();return false;} else if (fileInfo.length == 0) {$formTip.html("请选择书籍文件！");$alert.removeClass('hide');return false;} else if ($.inArray(getFileFormat(fileInfo),fileArr) == -1) {console.log(getFileFormat(fileInfo));$formTip.html("不支持该书籍文件！");$alert.removeClass('hide');return false;} else if (imageInfo.length == 0) {$formTip.html("请选择书籍封面！");$alert.removeClass('hide');return false;} else if ($.inArray(getFileFormat(imageInfo),imageArr) == -1) {console.log(getFileFormat(fileInfo));$formTip.html("封面格式错误，请重新上传");$alert.removeClass('hide');return false;} else {$formTip.html("正在上传...");$alert.removeClass('hide');return true;}}function getFileFormat(fileName) {return fileFormat = fileName.substring(fileName.lastIndexOf('.') + 1);}</script>
</body>
</html>（2）文件下载
http://localhost:8888/ebooknet_war_exploded/book_download?bookID=12211101211103496&filePath=E:/lianshu/ebooks/%E7%BB%8F%E5%85%B8%E6%96%87%E5%AD%A6/%E5%8F%A4%E5%85%B8%E6%96%87%E5%AD%A6/%E5%AD%9F%E5%AD%90.txt 
@RequestMapping(value = "/book_download")public void getBookDownload(long bookID, String filePath, HttpServletResponse response) {response.setContentType("text/html;charset=utf-8");String fileName = filePath.substring(filePath.lastIndexOf("/") + 1);BufferedInputStream bis = null;BufferedOutputStream bos = null;try {long fileLength = new File(filePath).length();response.setContentType("application/x-msdownload");response.setHeader("Content-disposition", "attachment; filename="+ new String(fileName.getBytes("utf-8"), "ISO8859-1"));response.setHeader("Content-Length", String.valueOf(fileLength));bis = new BufferedInputStream(new FileInputStream(filePath));bos = new BufferedOutputStream(response.getOutputStream());byte[] buff = new byte[2018];int bytesRead;while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {bos.write(buff, 0, bytesRead);}} catch (IOException e) {e.printStackTrace();} finally {try {if (bis != null) {bis.close();}if (bos != null) {bos.close();}} catch (IOException e) {e.printStackTrace();}bookService.addDownloadTimes(bookID);logger.info("you are downloading the book, the book file is " + fileName);}}
（3）修改头像
@RequestMapping(value = "/infoModify")public String infoModify(String name, String email, String avatarImg, HttpSession session) {logger.info("The user is modifying his information!");UserHelper userHelper = (UserHelper) session.getAttribute("userHelper");User user = new User();user.setId(userHelper.getId());user.setUserName(name);user.setEmail(email);int avatarId = userService.getAvatarId(avatarImg);//根据头像存储地址获取头像的编号user.setAvatarNum(avatarId);userService.updateUserInfo(user);User user1;user1 = userService.queryById(userHelper.getId());//获取新的用户信息UserHelper newUserHelper;newUserHelper = userService.getLoginUser(user1.getUserCode(), user1.getUserPassword());session.setAttribute("userHelper", newUserHelper);//重新存入Sessionreturn "redirect:/person";} 
